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Greatest common factor

Find the largest positive integer that divides both numbers.

How to use this tool

Find the largest positive integer that divides both numbers.

Choose factor scale and the number of questions.
Find the largest positive integer that divides both numbers.
Print the practice pages for learners; keep the answer pages for checking.

Up to 24 questions. Some topics use products of the selected range, so final values can be larger. Questions may repeat in small ranges.

Your entries stay in this browser. Print at 100% scale on matching A4 or Letter paper. Printing help

Sample questions

GCF of 27 and 45?
GCF of 28 and 4?
GCF of 15 and 60?

Check answers

9
4
15

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